Water Exclusion Surfaces (#3517)

* #3455 Add support for water exclusion surfaces

3 files changed, 29 insertions, 6 deletions

diff --git a/indra/newview/app_settings/shaders/class3/deferred/waterHazeF.glsl b/indra/newview/app_settings/shaders/class3/deferred/waterHazeF.glsl
index ee49b4baae..091c25d15e 100644
--- a/indra/newview/app_settings/shaders/class3/deferred/waterHazeF.glsl
+++ b/indra/newview/app_settings/shaders/class3/deferred/waterHazeF.glsl
@@ -35,13 +35,25 @@ vec4 getWaterFogView(vec3 pos);
 
 uniform int above_water;
 
+uniform sampler2D exclusionTex;
+
 void main()
 {
     vec2  tc           = vary_fragcoord.xy/vary_fragcoord.w*0.5+0.5;
     float depth        = getDepth(tc.xy);
+    float mask = texture(exclusionTex, tc.xy).r;
 
     if (above_water > 0)
     {
+        // Just discard if we're in the exclusion mask.
+        // The previous invisiprim hack we're replacing would also crank up water fog desntiy.
+        // But doing that makes exclusion surfaces very slow as we'd need to render even more into the mask.
+        // - Geenz 2025-02-06
+        if (mask < 1)
+        {
+            discard;
+        }
+
         // we want to depth test when the camera is above water, but some GPUs have a hard time
         // with depth testing against render targets that are bound for sampling in the same shader
         // so we do it manually here
@@ -51,12 +63,14 @@ void main()
         {
             discard;
         }
+
     }
 
     vec4  pos          = getPositionWithDepth(tc, depth);
 
     vec4 fogged = getWaterFogView(pos.xyz);
     fogged.a = max(pow(fogged.a, 1.7), 0);
+
     frag_color = max(fogged, vec4(0)); //output linear since local lights will be added to this shader's results
 
 }
diff --git a/indra/newview/app_settings/shaders/class3/environment/underWaterF.glsl b/indra/newview/app_settings/shaders/class3/environment/underWaterF.glsl
index 1c02dc764d..fa410e9f11 100644
--- a/indra/newview/app_settings/shaders/class3/environment/underWaterF.glsl
+++ b/indra/newview/app_settings/shaders/class3/environment/underWaterF.glsl
@@ -26,6 +26,7 @@
 out vec4 frag_color;
 
 uniform sampler2D bumpMap;
+uniform sampler2D exclusionTex;
 
 #ifdef TRANSPARENT_WATER
 uniform sampler2D screenTex;
@@ -59,6 +60,9 @@ void mirrorClip(vec3 position);
 void main()
 {
     mirrorClip(vary_position);
+    vec2 screen_tc = (refCoord.xy/refCoord.z) * 0.5 + 0.5;
+    float water_mask = texture(exclusionTex, screen_tc).r;
+
     vec4 color;
 
     //get detail normals
@@ -68,8 +72,8 @@ void main()
     vec3 wavef = normalize(wave1+wave2+wave3);
 
     //figure out distortion vector (ripply)
-    vec2 distort = (refCoord.xy/refCoord.z) * 0.5 + 0.5;
-    distort = distort+wavef.xy*refScale;
+    vec2 distort = screen_tc;
+    distort = mix(distort, distort+wavef.xy*refScale, water_mask);
 
 #ifdef TRANSPARENT_WATER
     vec4 fb = texture(screenTex, distort);
diff --git a/indra/newview/app_settings/shaders/class3/environment/waterF.glsl b/indra/newview/app_settings/shaders/class3/environment/waterF.glsl
index f8aa684433..7027e3796e 100644
--- a/indra/newview/app_settings/shaders/class3/environment/waterF.glsl
+++ b/indra/newview/app_settings/shaders/class3/environment/waterF.glsl
@@ -88,7 +88,7 @@ uniform sampler2D screenTex;
 uniform sampler2D depthMap;
 #endif
 
-uniform sampler2D refTex;
+uniform sampler2D exclusionTex;
 
 uniform float sunAngle;
 uniform float sunAngle2;
@@ -252,6 +252,8 @@ void main()
 
     float shadow = 1.0f;
 
+    float water_mask = texture(exclusionTex, distort).r;
+
 #ifdef HAS_SUN_SHADOW
     shadow = sampleDirectionalShadow(pos.xyz, norm.xyz, distort);
 #endif
@@ -266,9 +268,8 @@ void main()
     vec3 refPos = getPositionWithNDC(vec3(distort*2.0-vec2(1.0), depth*2.0-1.0));
 
     // Calculate some distance fade in the water to better assist with refraction blending and reducing the refraction texture's "disconnect".
-    fade = max(0,min(1, (pos.z - refPos.z) / 10));
+    fade = max(0,min(1, (pos.z - refPos.z) / 10)) * water_mask;
     distort2 = mix(distort, distort2, min(1, fade * 10));
-
     depth = texture(depthMap, distort2).r;
 
     refPos = getPositionWithNDC(vec3(distort2 * 2.0 - vec2(1.0), depth * 2.0 - 1.0));
@@ -282,6 +283,9 @@ void main()
 
 #else
     vec4 fb = applyWaterFogViewLinear(viewVec*2048.0, vec4(1.0));
+
+    if (water_mask < 1)
+        discard;
 #endif
 
     float metallic = 1.0;
@@ -333,6 +337,7 @@ void main()
     color = mix(fb.rgb, color, fade);
 
     float spec = min(max(max(punctual.r, punctual.g), punctual.b), 0.05);
-    frag_color = min(vec4(1),max(vec4(color.rgb, spec), vec4(0)));
+
+    frag_color = min(vec4(1),max(vec4(color.rgb, spec * water_mask), vec4(0)));
 }